$ diff claude-opus-5-5 granite-4-2
Claude Opus 5.5 vs Granite 4.2
Values come from Claude Opus 5.5 and Granite 4.2, where each is cited to its source. This page states no benchmark result and ranks neither model — it puts two published specifications next to each other. Where a lab has not published a figure, the row says so rather than guessing.
AnthropicClaude Opus 5.5
- context
- 1M
- weights
- closed
- $/M in
- $4
- $/M out
- $20
- context
- 512K
- weights
- open
- $/M in
- —
- $/M out
- —
What actually differs
- Context window
- Claude Opus 5.5 takes 1M against 512K — modestly more room in a single request.
- Weights
- Granite 4.2 publishes weights (Apache 2.0); Claude Opus 5.5 is API-only. That decides self-hosting, air-gapped deployment and fine-tuning before any capability question does.
- Recency
- Claude Opus 5.5 shipped 28 days after Granite 4.2 (2026-09-22 vs 2026-08-25).
Full spec
| Attribute | Claude Opus 5.5 | Granite 4.2 |
|---|---|---|
| Developer | Anthropic | IBM |
| Released | 2026-09-22 | 2026-08-25 |
| Context window | 1M tokens | 512K (30B); unknown (3B, 8B) |
| Pricing | $4/M input · $20/M output · cache reads $0.20/M · cache writes $5/M | not applicable — open weights, no hosted rate published |
| License | proprietary (API-only; no weight release) | Apache 2.0 |
| Availability | Claude apps, Claude Code, Claude API as `claude-opus-5-5`, Amazon Bedrock, Google Cloud Vertex AI, Microsoft Foundry | Hugging Face, Ollama, GitHub |